US Patent 7938075 Automated seed detection and planting synchronization apparatus, method and system

An automated seed detection and planting synchronization apparatus, method and system is disclosed. The invention includes a seed detection protocol configured to monitor a derived metric equated to timing of movement of a seed carried by a seed metering unit from a seed pick-up to seed drop point. For controlling synchronization of planting of seed, a seed metering unit empty notification signal is provided if the derived metric is satisfied and sensor readings confirm the absence of seed in the seed metering unit.